my boiler keeps over heating and shuts of, also one or two of the radiators are off cold most of the time, now it cuts of after a few minutes of working, but the rest of the radiators get hot any way when the system decides to stay on. any ideas please? i thought of pump but as i said 5 of the radiators get hot befor the over heat so it couldn't be that !!!??? please

ash, February 2010